Question of melonjs scale method

[cbbandtqb]

Hi, I have a beginner's question about melonjs.

 

If I run '<any sprite object>.scale(2);', then the sprite will move a little to the upper left on the screen, and the sprite's appearance will be about four times as large.

The anchorPoint of the sprite is (0.5,0.5)(=default), so I think the sprite can't move, it just doubles the size of the sprite, but what's wrong with my code?

 

My environment is melonjs 8.0.1, browser is chrome, OS is macOS High sierra.

 

Thank you.

[cbbandtqb]

I have one more report.

If I write {anchorPoint:(0.5, 0.5)} in 'init' explicitly, then the application freeze. Why?

[obiot]

hi,

can you copy paste the part of the code doing the scaling here just to be sure ? also is this on a me.Sprite object ? or for/in a an Entity ?

[cbbandtqb]

Thank you for your replying.

My code is below.

This is  on a me.Sprite, not for/in an Entity.

 

<play.js>

StretchingSprite = me.Sprite.extend({
    init : function(sx, sy, sc) {
        this._super(me.Sprite, 'init', [sx*chrX+chrX/2, sy*chrY+chrY/2, {image:chr[sc]}]);
        this.tm = 1;
        this.itv = 0;
    },
    update : function(dt) {
        this.itv += dt;
        if (this.itv < 100) {
            return true;
        }
        this.itv = 0;
        this.tm -= 0.2;
        if (this.tm < 1) {
            if (this.tm < 0) {
                this.tm = 0;
            }
            this.alpha = this.tm;
            this.scale(2-this.tm);
        }
        if (this.tm <= 0) {
            me.game.world.removeChild(this);
        }
        return true;
    }
});